ALSA: usb - fix race in creation of M-Audio Fast track pro driver
authorDavid Henningsson <david.henningsson@canonical.com>
Fri, 4 Jan 2013 16:02:18 +0000 (17:02 +0100)
committerTakashi Iwai <tiwai@suse.de>
Mon, 14 Jan 2013 09:03:03 +0000 (10:03 +0100)
commitb98ae2729dea161edc96c9d177459b6c28bcbba5
tree6467e4a5870af8b04ac4e2b38a569ba2f4e689e9
parent31be5425d795585251a3ee970319c37643e0cda2
ALSA: usb - fix race in creation of M-Audio Fast track pro driver

A patch in the 3.2 kernel caused regression with hotplugging the
M-Audio Fast track pro, or sound after suspend. I don't have the
device so I haven't done a full analysis, but it seems userspace
(both udev and pulseaudio) got confused when a card was created,
immediately destroyed, and then created again.

However, at least one person in the bug report (martin djfun)
reports that this patch resolves the issue for him. It also leaves
a message in the log:
"snd-usb-audio: probe of 1-1.1:1.1 failed with error -5" which is
a bit misleading. It is better than non-working audio, but maybe
there's a more elegant solution?

BugLink: https://bugs.launchpad.net/bugs/1095315
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/quirks.c